CN1648692A - Method for producing surface optical layer - Google Patents

Abstract

The present invention provides a method for manufacturing a surface optical layer, firstly coating a light-transmitting resin material having a plurality of light-transmitting particles on an optical thin plate, then first exposing the light-transmitting resin material with ultraviolet light of a first power value, and then curing the light-transmitting resin material with ultraviolet light of a second power value, wherein the second power value is greater than the first power value. In this way, the surface optical layer with different optical properties can be obtained by adjusting the intensity of the ultraviolet light for exposure and curing without changing the original formula of the surface optical layer and the coating process parameters.

Description

Surface optical layer manufacturing method

technical field

The present invention relates to a display device, and in particular to a method for manufacturing a surface optical layer.

Background technique

In the transmissive display, since the internal light source will be emitted outward, if the internal light source is not diffused and it continues to travel in a straight line, the user will feel the glare caused by the internal light source when visually viewing the display. Therefore, the surface of the display is often coated with a layer of anti-glare film to diffuse the light emitted from the light source inside the display. On the other hand, when the external light hits the surface of the display, if the external light is not diffused but reflected, it will be disturbed by the specular reflection light when the user looks at the display, which will make the user feel dazzling. Therefore, the anti-glare film In addition to being sufficient to diffuse the light emitted by the light source inside the display, it must also have the effect of reducing the effect of regular reflection of light incident outside the display.

At present, there are many technologies and patent documents discussing anti-glare films, such as the anti-glare film that diffuses external light disclosed in US Patent No. 5998013. This anti-glare film has light-transmitting particles dispersed in resin, and the light-transmitting particles The concavo-convex shape gathered on the surface of the anti-glare film diffuses the light. Moreover, in the prior art, the method of changing the concave-convex shape of the anti-glare film surface, such as increasing the particle size of the light-transmitting particles or adjusting the doping density of the light-transmitting particles, is used to change the diffusivity of the anti-glare film to external light. Or its own optical properties such as haze, clarity and gloss.

However, once the particle size or doping density of the light-transmitting particles in the anti-glare film is changed, the process parameters for coating the anti-glare film, such as coating speed, baking temperature and time, must also be changed accordingly. However, in practice, customers often ask manufacturers to adjust the specifications of the anti-glare film after the formulation of the anti-glare film and the parameters of the coating process are determined. formula, and then after several attempts and adjustments to the parameters of the coating process, an anti-glare film that meets the specifications required by the customer can be obtained. This traditional method not only wastes costs, but also consumes manpower and prolongs the preparation time for mass production, so it is an uneconomical method for manufacturing anti-glare films.

Contents of the invention

The object of the present invention is to provide an anti-glare film, which is applied in a display to diffuse light so that observers will not feel glare when viewing the display, thereby increasing the visibility of the display.

Another object of the present invention is to provide a method for manufacturing an anti-glare film, which only changes the exposure process steps of the anti-glare film, and maintains its original formula and coating process parameters, so as to improve the optical properties of the anti-glare film. And adjust the mobility.

Another object of the present invention is to provide a method for manufacturing the surface optical layer, which replaces the complex manufacturing process of the prior art in a very simple manner, so as to save manufacturing cost and R&D manpower, and shorten the preparation time for mass production.

According to the above purpose, the present invention provides a method for manufacturing a surface optical layer. Firstly, a light-transmitting resin material having several light-transmitting particles is coated on an optical thin plate, and then the light-transmitting resin material is first exposed to ultraviolet light of a first power value. The optical resin material is hardened by ultraviolet light of a second power value, wherein the second power value is greater than the first power value. In this way, without changing the original formula of the surface optical layer and coating process parameters, the intensity of ultraviolet light for exposure hardening can be adjusted to obtain surface optical layers with different optical properties.

According to a preferred embodiment of the present invention, the surface optical layer is an anti-glare film, an anti-reflection film or other optical films that need to be hardened by ultraviolet light. After coating the light-transmitting resin material, a step of baking the optical thin plate is also included to remove solvents in the light-transmitting resin material, such as volatile materials such as toluene or isopropanol. The material of the light-transmitting resin material includes a light-curable resin, and the material of the light-transmitting particles includes silicon dioxide. The optical thin plate is a polarizing plate, and the optical thin plate is in contact with the antiglare film with a triacetate cellulose layer. In this preferred embodiment, the wavelength of the ultraviolet light is less than 400 nanometers, and the ratio of the second power value of the ultraviolet light to the first power value ranges from 500 to 3000, and the preferred range is from 500 to 3000. Between 1000.

The invention uses at least two kinds of ultraviolet light with different powers to expose and harden the surface optical layer, so as to replace the existing complex process for adjusting the optical properties of the surface optical layer. Therefore, on the premise of maintaining the original formula and coating process parameters, the manufacturer can change its optical properties only by changing the ultraviolet light exposure intensity of the surface optical layer, so that the surface optical layer can be easily improved and flexible with customer needs during manufacturing. Adjustability and convenience. In addition, because the method of the present invention is simple and easy to implement, the manufacturing cost and research and development manpower can be greatly saved, and the preparation time for mass production can be shortened.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and accompanying drawings of the present invention. However, the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present invention.

Brief description of the drawings

The technical solutions and other beneficial effects of the present invention will be apparent through the detailed description of specific embodiments of the present invention below in conjunction with the accompanying drawings.

In the attached picture,

Fig. 1 is a flow chart according to a preferred embodiment of the present invention: and

Fig. 2 is a cross-sectional structure diagram of a preferred embodiment of the present invention.

Detailed ways

In order to further elaborate the technical means and effects adopted by the present invention to achieve the predetermined purpose, please refer to the following detailed description and accompanying drawings of the present invention. It is believed that the purpose, characteristics and characteristics of the present invention should be able to gain a deep and specific understanding from this , however, the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present invention.

In the present invention, a light-transmitting resin material with several light-transmitting particles is coated on an optical thin plate, and then the light-transmitting resin material is exposed and cured by at least two kinds of ultraviolet light with different power values. When first exposed to ultraviolet light with a weaker power value, the light-transmitting resin material has not yet fully hardened. This step is a key step in changing the optical properties of the surface optical layer. The higher the haze, but still maintain good light transmittance.

Please refer to FIG. 1 , which shows a flow chart according to a preferred embodiment of the present invention. The preferred embodiment takes an anti-glare film as an example. As shown in FIG. 1 , the manufacturing method of the present invention firstly provides a light-transmitting resin material with several light-transmitting particles in the light-transmitting resin material (step 102 ). Next, coating the light-transmitting resin material on the surface of an optical sheet (step 104). Then, first expose the light-transmitting resin material with ultraviolet light of a first power value (step 106), and then harden the light-transmitting resin material with ultraviolet light of a second power value (step 108), wherein the second power value is greater than the first power value. In addition, in this preferred embodiment, after coating the light-transmitting resin material on the optical sheet, a step of baking the optical sheet (step 105) may be added to remove the solvent contained in the light-transmitting resin material, for example Volatile materials such as toluene or isopropanol.

As mentioned above, the present invention can change the optical properties of the anti-glare film only by adjusting the intensity of ultraviolet light for exposure curing, without changing the original formula and coating process parameters of the anti-glare film. According to the experimental results of the embodiments of the present invention, the ratio of the second power value of the ultraviolet light to the first power value ranges from 500 to 3000, and the preferred range is from 500 to 1000.

In this preferred embodiment, the material of the light-transmitting resin material includes a light-curable resin, such as a UV-curable resin, and the material of the light-transmitting particles includes silicon dioxide, and the wavelength of the ultraviolet light is less than 400 nanometers. In addition, the first power value is set to be about 120 milliwatts, while the second power value is set to be about 80 watts, and the latter is about 667 times of the former. Table 1 is a comparison table of optical properties between the traditional exposure process of the prior art and the two-stage exposure process of the present invention, which enumerates in sequence the application of the traditional exposure process, and the exposure process of 120 milliwatts of ultraviolet light for 15 seconds, The experimental data of optical properties such as clarity, haze, and light transmittance of the anti-glare film for 30 seconds and 60 seconds are used to illustrate the implementation and effect of the present invention.

Table 1: Comparison of the optical properties of the conventional exposure process of the prior art and the two-stage exposure process of the present invention. exposure conditions clarity Haze Transmittance Traditional Exposure Process 148.3 32.79 91.33 120 mW UV exposure for 15 seconds 169.9 34.78 91.18 120 mW UV light exposure for 30 seconds 146 39.66 91.13 120 mW UV exposure for 60 seconds 118.2 45.62 91.29

It can be seen from Table 1 that the optical properties such as clarity and haze of the anti-glare film produced by the manufacturing method of the present invention will indeed be affected by the low-power ultraviolet light exposure step and cause changes. The longer the exposure time of the low-power ultraviolet light is, the higher the haze of the anti-glare film is, and the worse the clarity is. However, it is worth noting that the manufacturing method of the present invention does not affect the light transmittance of the anti-glare film, as shown in Table 1. That is to say, the present invention not only can be used to adjust the haze of the anti-glare film of the display, but also does not reduce the most important brightness and contrast performance of the display. It is a practical invention without negative effects.

The present invention adds a weaker power ultraviolet light exposure process to the high power ultraviolet light exposure process of the prior art to replace the time-consuming and laborious traditional technology that must change the anti-glare film formula and its coating process parameters. Since the low-power ultraviolet light can slowly float the light-transmitting particles on the surface of the light-transmitting resin material, the surface roughness of the anti-glare film is increased to achieve the effect of increasing the haze of the anti-glare film.

FIG. 2 is a cross-sectional structural diagram of a preferred embodiment of the present invention. The light-transmitting resin material 204 with several light-transmitting particles 206 is coated on the surface of the optical sheet 202 to serve as the anti-glare film 212 of the optical sheet 202 . The optical thin plate 202 is a polarizer, and a triacetate cellulose layer is in contact with the anti-glare film 212 . At this time, the surface structure characteristics of the anti-glare film 212 can be represented by two values, surface roughness (Ra) and mean spacing of local peaks of the profile (S), as shown in FIG. 2 . Table 2 lists the experimental data of surface roughness (Ra) and surface particle average distance (S) of the proposed traditional exposure process and 120 mW UV exposure process for 15 seconds, 30 seconds and 60 seconds respectively in order, as shown in Table 2. It shows that the manufacturing method of the present invention can indeed be used to change the surface structure of the anti-glare film.

Table 2: Comparison of surface properties between the conventional exposure process of the prior art and the two-stage exposure process of the present invention. exposure conditions Surface roughness (μm) Average distance of surface particles (mm) Traditional Exposure Process 0.19 0.049 120 mW UV exposure for 15 seconds 0.22 0.041 120 mW UV light exposure for 30 seconds 0.26 0.034 120 mW UV exposure for 60 seconds 0.33 0.032

It can be seen from Table 2 that the anti-glare film produced by the manufacturing method of the present invention will indeed be affected by the low-power ultraviolet light exposure step to cause changes in its surface structure properties such as surface roughness and average distance between surface particles. The longer the exposure time of the low-power ultraviolet light is, the larger the surface roughness of the anti-glare film is, and the smaller the average distance between the surface particles is.

It should be noted here that, in addition to anti-glare films, the manufacturing method of the present invention can also be applied to manufacture anti-reflection films or other optical films that need to be cured by ultraviolet light. In addition, the steps of the present invention include at least two ultraviolet exposure hardening steps: first exposing the light-transmitting resin material with low-power ultraviolet light, and then hardening the light-transmitting resin material with high-power ultraviolet light. However, in the whole exposure process, more steps of ultraviolet exposure hardening steps with different power values are applied, or methods such as exposure hardening in order of intensity or non-sequentially alternately before the light-transmitting resin material is completely hardened, etc. Various applications that should be regarded as conforming to the concept of the present invention should be included within the scope of the present invention.

As mentioned above, for those of ordinary skill in the art, various other corresponding changes and deformations can be made according to the technical scheme and technical concept of the present invention, and all these changes and deformations should belong to the protection of the claims of the present invention. scope.

Claims (9)

1. A method for manufacturing a surface optical layer, characterized in that the method for manufacturing at least comprises: Provide a light-transmitting resin material, the light-transmitting resin material has several light-transmitting particles; Coating the light-transmitting resin material on an optical sheet; and The light-transmitting resin material is irradiated with at least two kinds of ultraviolet light with different power values, so as to expose and harden the light-transmitting resin material. 2 . The method for manufacturing the surface optical layer according to claim 1 , wherein the material of the light-transmitting resin material comprises a photocurable resin. 3 . 3 . The method for manufacturing a surface optical layer according to claim 1 , wherein the material of the light-transmitting particles includes silicon dioxide. 4 . 4. The method for manufacturing a surface optical layer as claimed in claim 1, wherein the optical thin plate is a polarizer. 5 . The method for manufacturing the surface optical layer as claimed in claim 4 , wherein a triacetate cellulose layer is in contact with the light-transmitting resin material in the polarizer. 6 . 6 . The method for manufacturing the surface optical layer according to claim 1 , further comprising: baking the optical sheet after coating the light-transmitting resin material. 7 . 7 . The method for manufacturing a surface optical layer according to claim 1 , wherein the ratio of the maximum value to the minimum value of the power values ranges from 500 to 3000. 8 . 8 . The method for manufacturing a surface optical layer as claimed in claim 1 , wherein a preferred ratio range of the maximum value to the minimum value of the power values is between 500 and 1000. 9 . 9. The method for manufacturing a surface optical layer as claimed in claim 1, wherein the wavelength of the ultraviolet light is less than 400 nanometers.

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